Roberto Perotti, professor of economics at Universita Bocconi, listens at a macro policy discussion during the International Monetary Fund (IMF) and World Bank Group Spring Meetings in Washington, D.C., U.S., on Wednesday, April 17, 2013. As much as 20 percent of non-bank corporate debt in the weakest euro-area economies is unsustainable and may force companies to cut dividends and sell assets, dealing further blows to investor confidence, the IMF said. Photographer: Andrew Harrer/Bloomberg via Getty Images